Modular storage unit



FIG. 1 is a top plan view of a modular storage unit showing our new design;

FIG. 2 is a top right perspective view thereof;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a left elevational view as seen when in use.

The rear of the unit forms no part of the claimed design. 

The ornamental design for a modular storage unit, as shown and described. 